netdev - Re: Add a SOCK_DESTROY operation to close sockets from userspace

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Message-Id: <20151118.153508.123902005995190872.davem@davemloft.net>
Date:	Wed, 18 Nov 2015 15:35:08 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	lorenzo@...gle.com
Cc:	hannes@...essinduktion.org, eric.dumazet@...il.com,
	stephen@...workplumber.org, netdev@...r.kernel.org,
	edumazet@...gle.com, ek@...gle.com, maze@...gle.com,
	dtor@...gle.com
Subject: Re: Add a SOCK_DESTROY operation to close sockets from userspace

From: Lorenzo Colitti <lorenzo@...gle.com>
Date: Wed, 18 Nov 2015 19:47:21 +0900

> On Wed, Nov 18, 2015 at 7:19 PM, Hannes Frederic Sowa
> <hannes@...essinduktion.org> wrote:
>> I bet there will soon be a timewaitd which handles the not configurable
>> (David has rejected all those patches so far) timeout of TIME_WAIT
>> sockets. And I bet it will be used. :/
> 
> No, SOCK_DESTROY has no effect on TCP_TIME_WAIT sockets or any other
> non-full socket.
> 
> When called on any socket where sk_fullsock(sk) is false, it returns
> EOPNOTSUPP because there is nothing to do. Its purpose is to interrupt
> blocked userspace socket calls, not to release resources.

+1
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